Start up a Co-op With COM game. Set the COM to offensive. First you need to put just a couple blocks down and wait for the COM, it is recommended to wait till Level 6 before you attempt this. As soon as your computer partner starts his chain you need to press the button to throw your piece down and do you chain. If you did that correctly, it should say sync bonus. Repeat 4 more times. After you get 1 successful sync bonus go ahead and lose on purpose and repeat the same thing. Doesn't matter if you die. After your 5th sync bonus this will unlock:
Note: If you are going to vote negatively please comment or PM me first as I am willing to adjust anything that needs to be for this to be proper.